Traction Motor Dynamic Braking for Parking Brake Stability
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Solution Overview
Problem
In rail vehicle operations, the failure to release parking brakes during coupling and decoupling can lead to issues such as worn brake shoes, cracked or broken wheels, and damaged rails due to unintended movement.
Innovation Solution
A system comprising traction motors connected to vehicle wheels, capable of providing both motive power and braking effort, with a controller that detects the engagement of the parking brake and applies a braking force to resist movement when the brake is engaged, preventing vehicle movement and potential damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If hand brakes or parking brakes are applied to prevent unwanted movement of parked vehicles, then vehicle stability is improved, but the complexity of the braking system increases
Solution Approach 1:
The patent combines the parking brake system with the dynamic braking system by using the same controller (locomotive controller) to manage both static and dynamic braking operations. The controller integrates parking brake status detection with dynamic braking control, merging previously separate functions into a unified control architecture that reduces overall system complexity.
Solution Approach 2:
The locomotive controller serves multiple functions: it controls dynamic braking during operation, monitors parking brake engagement status, and activates dynamic braking to supplement the parking brake when movement is detected. This multi-functional approach eliminates the need for separate control systems for parking and dynamic braking.
2Stability of the object's composition
If the parking brake is engaged to hold the vehicle stationary, then the authority to maintain static position is improved, but the risk of wheel and rail damage increases if movement occurs
Solution Approach 1:
The system applies dynamic braking in advance to counteract any attempted movement while the parking brake is engaged. When the controller detects parking brake engagement and subsequent movement, it immediately activates dynamic braking to oppose the movement, preventing the harmful effects of brake shoe wear, wheel overheating, and rail damage before they can occur.
Solution Approach 2:
The system converts the potential harmful effect of unintended vehicle movement into a beneficial outcome by using the detected movement as a trigger to activate dynamic braking. The harmful movement attempt becomes the signal that activates the protective dynamic braking response, transforming the problem into a solution.
3Reliability
If dynamic braking is applied to supplement the parking brake when movement is detected, then protection against wheel and rail damage is improved, but the device complexity increases
Solution Approach 1:
The locomotive controller automatically performs the function of detecting parking brake engagement and activating dynamic braking supplementation without requiring separate control systems or manual intervention. The existing controller serves itself by integrating the parking brake monitoring and dynamic braking activation functions, eliminating the need for additional dedicated control devices.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively prevents vehicle movement when the parking brake is engaged, reducing the risk of wheel and rail damage, and enhancing the authority of the parking brake to maintain a static position, thereby mitigating operational hazards.
Implementation Method 1
The traction motors are configured to provide both motive power for the vehicle system in a propel mode of operation and retarding effort to brake the vehicle system in a braking mode of operation
Implementation Method 2
a parking brake for maintaining a static position of the vehicle system when in an engaged state
Data Source
AI summary
A system includes a drive system having one or more traction motors coupled in driving relationship to a plurality of wheels of a vehicle system. The traction motors are configured to provide both motive power for the vehicle system in a propel mode of operation and retarding effort to brake the vehicle system in a braking mode of operation. The system further includes a parking brake for maintaining a static position of the vehicle system when in an engaged state, and a controller configured to detect when the parking brake is in the engaged state. The controller is further configured to control at least one of the one or more traction motors to provide a braking effort to resist movement of the vehicle system when the parking brake is in the engaged state.